2.1.5 [SVG11] Section 10.6, The 'tref' element


The specification states:

 The textual content for a ‘text’ can be either character data directly embedded within the ‘text’ element or the character data content of a referenced element, where the referencing is specified with a ‘tref’ element.

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

The tref element and its attributes are not supported.